Inlet control system for supersonic aircraft



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.6. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JUNE 16, 1970 Pinyin wean: PR

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A method and apparatus for controlling the inlet area of a variable geometry engine inlet. The method for controlling the inlet area includes (a) measuring the actual pressure ratio of the engine inlet; (b) varying the inlet area in response to a change in the actual pressure ratio; (0) generating a reference pressure ratio which is a function of the inlet area; and (d) balancing the actual pressure ratio with the reference pressure ratio. This balancing of the actual and reference pressure ratios is carried out through a feedback mechanism from the engine plant to the reference generating means.

June 16, 1970.

INLET THROAT H'EIGHT, h, FEET R. c. LOSCHKE T875,015

y INLET CONTROL SYSTEM FOR SUPERSONIC AIRCRAFT Original Filed Feb. 28. 1967 5 Sheets-Sheet 1 |.4 s |.e I 2.0 2.2 2.4 2.6

INLET LOCAL MACH -o., ML

INVENTOR.

FIG- 2 ROBERTC. LOSCHKE Agent T875015 INLET CONTROL SYSTEM FOR SUPERSONIC AIRCRAFT Original Filed Feb. 28. 1967 June 1%, 1970 R. c. LOSCHKE 5 Sheets-Sheet 2 .FIG..3

g E, H F l O mmnmwmma THROAT HEIGHT, h FEET THROAT HEIGHT REFERENCE FLIGHT CONDITION LOCAL MACH NUMBER INVENTOR. ROBERT C. LOSCHK E INLET CHARACTERISTICS ACTUAL PRESSURE RATIO FIG 4 Agent INLET CONTROL SYSTEM FOR SUPERSONIC AIRCRAFT 5 Sheets-Sheet 25 Original Filed Feb. 28. 1967 INVENTOR. ROBERT C. LOSCHKE June 16, 1970 R. C. LOSCHKE INLET CONTROL SYSTEM FOR SUPERSONIC AIRCRAFT Original Filed Feb. 28. 1967 5 Sheets-Sheet 4.

ROBERT c. LOSCHKE Agent INLET CONTROL SYSTEM FOR SUPERSONIC AIRCRAFT 5 Sheets-Sheet 5 R. C. LOSCHKE June 1 1970 Original Filed Feb. 28. 1967 INVENTOR. ROBERT C. LOSCHKE Agent 

